The Lizard, the Ox, and the Eagle were the three leaders who did not wish to fight.
The Swan, the Elephant, and the Deer absolutely wanted to fight to get revenge on the person who killed their ruler.
It was needless to say the Lion wanted to fight as well.
4 out of the 7 leaders of the beast colonies wanted to go kill the Dragon Emperor. However, all decisions from the leaders must be unanimous or else the beasts couldn't act.
Each of the beasts sat back down and started talking amongst themselves to try and convince each other why they had to do the same as them.
"He was our ruler. We have a requirement to avenge him," the Deer said. "How can you just stay by and give up on such an opportunity to kill him?"